Data processing: financial – business practice – management – or co – Business processing using cryptography – Usage protection of distributed data files
Reexamination Certificate
2008-06-10
2008-06-10
Backer, Firmin (Department: 3621)
Data processing: financial, business practice, management, or co
Business processing using cryptography
Usage protection of distributed data files
C705S050000, C705S052000, C726S026000, C726S030000, C713S187000, C713S600000
Reexamination Certificate
active
07386513
ABSTRACT:
A method, system, and computer program product for exercising rights based on determining trust in an issuance of a rights expression, including issuing rights expressions by a chain of servers, forming a chain of rights expressions issued from server to server and finally from the last server to a client, such that each of the rights expressions except the last includes a specification of rights for the next server to issue the rights in the next rights expression; determining whether or not each of the servers has a right to issue the respective rights expression; exercising by the client the rights expressed in the last rights expression as being trusted, if it is determined that each of the servers had a right to issue the respective rights expression; and not exercising by the client the rights expressed in the last rights expression as not being trusted, if it is determined that at least one of the servers did not have the right to issue the respective rights expression.
REFERENCES:
patent: 7134144 (2006-11-01), McKune
patent: 2002/0019814 (2002-02-01), Ganesan
patent: 2003/0125976 (2003-07-01), Nguyen et al.
Chen Eddie J
DeMartini Thomas
Gilliam Charles P
Ham Manuel
Lao Guillermo
Backer Firmin
Contentguard Holdings Inc.
Kaufman Marc S.
Nixon & Peabody LLP
Villamar Carlos
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